The Pulse of Radio reports that Trent Reznor has introduced an "unplugged" portion into the new NINE INCH NAILS live show, which premiered on Saturday (July 26) in Seattle. According to RollingStone.com, the band stepped to the front of the stage about an hour into the show with Reznor on vibraphone and bassist Justin Meldal-Johnsen playing an upright bass. The 20-minute jazzy, acoustic set was taken mostly from "Ghosts I - IV", the instrumental album that Reznor released online earlier this year. The stage show also featured mesh LED curtains that projected various visuals, ranging from falling rain to static to a ruined city, and made the band appear to be playing on what Jam! Music called "a stage that appeared to be constructed entirely out of lights."

The two-hour set featured NIN classics such as "Closer", "Terrible Lie", "Hurt", "March of the Pigs" and "Head Like A Hole", in addition to songs from the band's latest album, "The Slip".

"The Slip" was issued as a free download last month and arrived on July 22 in North America as an individually numbered limited edition. It was packaged with a bonus DVD of rehearsal performances. It has sold 29,000 copies in the United States in its first week of release to debut at position No. 13 on The Billboard 200 chart.

A vinyl edition of the record will be released on August 12, while the digital version will remain free for download indefinitely at NIN.com.

The previous NIN album, "Ghosts I - IV", was made available in March in a variety of digital and physical configurations.

NINE INCH NAILS next plays in Winnipeg, Canada on Thursday (July 31) and will headline the closing day of this weekend's Lollapalooza festival in Chicago on Sunday (August 3).